<!--
 * @Descripttion: 
 * @Author: yizheng.yuan
 * @Date: 2021-05-23 11:59:15
 * @LastEditors: yizheng.yuan
 * @LastEditTime: 2021-05-23 12:10:45
-->
<html>
  <head>
    <title>css学习</title>
    <style>
      *{
        margin: 0;
        padding: 0;
      }
    </style>
  </head>

  <body>
    
    <div style="border: 1px solid red;">
      <div style="width: 500px; height: 200px; border: 1px solid blue; margin-top: 20px; margin-bottom: 20px; padding: 10px;">
          <p style="border: 1px solid black;">
            我的手机
          </p>
      </div>
    </div>

    <div style="border: 1px solid red; margin-top: 15px;">
      我的第二部分内容
    </div>

  </body>
</html>